3 * Copyright (c) 2009, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
23 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
29 #include "VmbusPrivate.h"
32 struct VMBUS_CONNECTION gVmbusConnection = {
33 .ConnectState = Disconnected,
34 .NextGpadlHandle = ATOMIC_INIT(0xE1E10),
38 * VmbusConnect - Sends a connect request on the partition service connection
40 int VmbusConnect(void)
43 struct vmbus_channel_msginfo *msgInfo = NULL;
44 struct vmbus_channel_initiate_contact *msg;
49 /* Make sure we are not connecting or connected */
50 if (gVmbusConnection.ConnectState != Disconnected)
53 /* Initialize the vmbus connection */
54 gVmbusConnection.ConnectState = Connecting;
55 gVmbusConnection.WorkQueue = create_workqueue("hv_vmbus_con");
56 if (!gVmbusConnection.WorkQueue) {
61 INIT_LIST_HEAD(&gVmbusConnection.ChannelMsgList);
62 spin_lock_init(&gVmbusConnection.channelmsg_lock);
64 INIT_LIST_HEAD(&gVmbusConnection.ChannelList);
65 spin_lock_init(&gVmbusConnection.channel_lock);
68 * Setup the vmbus event connection for channel interrupt
71 gVmbusConnection.InterruptPage = osd_PageAlloc(1);
72 if (gVmbusConnection.InterruptPage == NULL) {
77 gVmbusConnection.RecvInterruptPage = gVmbusConnection.InterruptPage;
78 gVmbusConnection.SendInterruptPage =
79 (void *)((unsigned long)gVmbusConnection.InterruptPage +
83 * Setup the monitor notification facility. The 1st page for
84 * parent->child and the 2nd page for child->parent
86 gVmbusConnection.MonitorPages = osd_PageAlloc(2);
87 if (gVmbusConnection.MonitorPages == NULL) {
92 msgInfo = kzalloc(sizeof(*msgInfo) +
93 sizeof(struct vmbus_channel_initiate_contact),
95 if (msgInfo == NULL) {
100 msgInfo->WaitEvent = osd_WaitEventCreate();
101 msg = (struct vmbus_channel_initiate_contact *)msgInfo->Msg;
103 msg->Header.MessageType = ChannelMessageInitiateContact;
104 msg->VMBusVersionRequested = VMBUS_REVISION_NUMBER;
105 msg->InterruptPage = virt_to_phys(gVmbusConnection.InterruptPage);
106 msg->MonitorPage1 = virt_to_phys(gVmbusConnection.MonitorPages);
107 msg->MonitorPage2 = virt_to_phys(
108 (void *)((unsigned long)gVmbusConnection.MonitorPages +
112 * Add to list before we send the request since we may
113 * receive the response before returning from this routine
115 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
116 list_add_tail(&msgInfo->MsgListEntry,
117 &gVmbusConnection.ChannelMsgList);
119 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
121 DPRINT_DBG(VMBUS, "Vmbus connection - interrupt pfn %llx, "
122 "monitor1 pfn %llx,, monitor2 pfn %llx",
123 msg->InterruptPage, msg->MonitorPage1, msg->MonitorPage2);
125 DPRINT_DBG(VMBUS, "Sending channel initiate msg...");
126 ret = VmbusPostMessage(msg,
127 sizeof(struct vmbus_channel_initiate_contact));
129 list_del(&msgInfo->MsgListEntry);
133 /* Wait for the connection response */
134 osd_WaitEventWait(msgInfo->WaitEvent);
136 list_del(&msgInfo->MsgListEntry);
138 /* Check if successful */
139 if (msgInfo->Response.VersionResponse.VersionSupported) {
140 DPRINT_INFO(VMBUS, "Vmbus connected!!");
141 gVmbusConnection.ConnectState = Connected;
144 DPRINT_ERR(VMBUS, "Vmbus connection failed!!..."
145 "current version (%d) not supported",
146 VMBUS_REVISION_NUMBER);
151 kfree(msgInfo->WaitEvent);
158 gVmbusConnection.ConnectState = Disconnected;
160 if (gVmbusConnection.WorkQueue)
161 destroy_workqueue(gVmbusConnection.WorkQueue);
163 if (gVmbusConnection.InterruptPage) {
164 osd_PageFree(gVmbusConnection.InterruptPage, 1);
165 gVmbusConnection.InterruptPage = NULL;
168 if (gVmbusConnection.MonitorPages) {
169 osd_PageFree(gVmbusConnection.MonitorPages, 2);
170 gVmbusConnection.MonitorPages = NULL;
174 kfree(msgInfo->WaitEvent);
184 * VmbusDisconnect - Sends a disconnect request on the partition service connection
186 int VmbusDisconnect(void)
189 struct vmbus_channel_message_header *msg;
193 /* Make sure we are connected */
194 if (gVmbusConnection.ConnectState != Connected)
197 msg = kzalloc(sizeof(struct vmbus_channel_message_header), GFP_KERNEL);
199 msg->MessageType = ChannelMessageUnload;
201 ret = VmbusPostMessage(msg,
202 sizeof(struct vmbus_channel_message_header));
206 osd_PageFree(gVmbusConnection.InterruptPage, 1);
208 /* TODO: iterate thru the msg list and free up */
209 destroy_workqueue(gVmbusConnection.WorkQueue);
211 gVmbusConnection.ConnectState = Disconnected;
213 DPRINT_INFO(VMBUS, "Vmbus disconnected!!");
222 * GetChannelFromRelId - Get the channel object given its child relative id (ie channel id)
224 struct vmbus_channel *GetChannelFromRelId(u32 relId)
226 struct vmbus_channel *channel;
227 struct vmbus_channel *foundChannel = NULL;
230 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
231 list_for_each_entry(channel, &gVmbusConnection.ChannelList, ListEntry) {
232 if (channel->OfferMsg.ChildRelId == relId) {
233 foundChannel = channel;
237 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
243 * VmbusProcessChannelEvent - Process a channel event notification
245 static void VmbusProcessChannelEvent(void *context)
247 struct vmbus_channel *channel;
248 u32 relId = (u32)(unsigned long)context;
253 * Find the channel based on this relid and invokes the
254 * channel callback to process the event
256 channel = GetChannelFromRelId(relId);
259 VmbusChannelOnChannelEvent(channel);
261 * WorkQueueQueueWorkItem(channel->dataWorkQueue,
262 * VmbusChannelOnChannelEvent,
266 DPRINT_ERR(VMBUS, "channel not found for relid - %d.", relId);
271 * VmbusOnEvents - Handler for events
273 void VmbusOnEvents(void)
276 int maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
279 u32 *recvInterruptPage = gVmbusConnection.RecvInterruptPage;
284 if (recvInterruptPage) {
285 for (dword = 0; dword < maxdword; dword++) {
286 if (recvInterruptPage[dword]) {
287 for (bit = 0; bit < 32; bit++) {
288 if (test_and_clear_bit(bit, (unsigned long *)&recvInterruptPage[dword])) {
289 relid = (dword << 5) + bit;
290 DPRINT_DBG(VMBUS, "event detected for relid - %d", relid);
293 /* special case - vmbus channel protocol msg */
294 DPRINT_DBG(VMBUS, "invalid relid - %d", relid);
297 /* QueueWorkItem(VmbusProcessEvent, (void*)relid); */
298 /* ret = WorkQueueQueueWorkItem(gVmbusConnection.workQueue, VmbusProcessChannelEvent, (void*)relid); */
299 VmbusProcessChannelEvent((void *)(unsigned long)relid);
312 * VmbusPostMessage - Send a msg on the vmbus's message connection
314 int VmbusPostMessage(void *buffer, size_t bufferLen)
316 union hv_connection_id connId;
319 connId.u.Id = VMBUS_MESSAGE_CONNECTION_ID;
320 return HvPostMessage(connId, 1, buffer, bufferLen);
324 * VmbusSetEvent - Send an event notification to the parent
326 int VmbusSetEvent(u32 childRelId)
332 /* Each u32 represents 32 channels */
333 set_bit(childRelId & 31,
334 (unsigned long *)gVmbusConnection.SendInterruptPage +
337 ret = HvSignalEvent();